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Direct numerical simulation of a turbulent flow over an axisymmetric hill

Castagna, Jony; Yao, Yufeng; Yao, Jun

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Authors

Jony Castagna

Yufeng Yao Yufeng.Yao@uwe.ac.uk
Professor in Aerospace Engineering

Dr Jun Yao Jun.Yao@uwe.ac.uk
Senior Lecturer Aerospace Themofluids



Abstract

Direct numerical simulation (DNS) of a turbulent flow over an axisymmetric hill has been carried out to study the three-dimensional flow separation and reattachment that occur on the lee-side of the geometry. The flow Reynolds number is Re H=6500, based on free-stream quantities and hill height (H). A synthetic inflow boundary condition, combined with a data feed-in method, has been used to generate the turbulent boundary layer approaching to the hill. The simulation has been run using a typical DNS resolution of δx + = 12.5, δz + = 6.5, and δy1+=1.0 and about 10 points in the viscous sublayer. It was found that a separation bubble exists at the foot of the wind-side of the hill and the incoming turbulent boundary layer flow undergoes re-laminarization process around the crest of the hill. These lead to a significant flow separation at the lee-side of the hill, where a very large primary separation bubble embedded with a smaller secondary separations have been captured. The present low-Re simulation reveals some flow features that are not observed by high-Re experiments, thus is useful for future experimental studies. © 2014 Elsevier Ltd.

Citation

Castagna, J., Yao, Y., & Yao, J. (2014). Direct numerical simulation of a turbulent flow over an axisymmetric hill. Computers and Fluids, 95, 116-126. https://doi.org/10.1016/j.compfluid.2014.02.014

Journal Article Type Article
Acceptance Date Feb 11, 2014
Publication Date May 22, 2014
Deposit Date Mar 10, 2016
Publicly Available Date Mar 10, 2016
Journal Computers and Fluids
Print ISSN 0045-7930
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 95
Pages 116-126
DOI https://doi.org/10.1016/j.compfluid.2014.02.014
Keywords turbulence simulation, 3D flow separation
Public URL https://uwe-repository.worktribe.com/output/817412
Publisher URL http://dx.doi.org/10.1016/j.compfluid.2014.02.014

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